TS3121_V01 STM | Alldatasheet
Document overview
- Manufacturer or author: Provided By alldatasheet.com(free datasheet download site)
- PDF pages: 34
Technical content
Datasheet sections
- 1 Pin configuration
- 2 Maximum ratings
- 3 Electrical characteristics
- 4 Typical performance characteristics
- 5 Application information
- 6 Typical applications
- 7 Package information
- 7.1 SC70-5 (or SOT323-5) package information
- 7.2 SOT23-5 package information
- 8 Ordering information
Features
- Low offset voltage: 2 mV max @ 25 °C (A-grade version)
- Low power consumption: 70 μA typ.
- Wide supply voltage: 1.7 to 5.5 V
- Propagation delay: 60 ns
- Rail-to-rail input
- Open-drain output
- Fail-safe input/output pins
- Input/output pins withstand voltages higher than VCC
- Fail-safe architecture keeps output in high impedance when VCC = 0 V
- Guaranteed start-up time allows sequential on/off cycles of VCC
- High ESD tolerance: 4 kV HBM
- Extended temperature range: -40 to +125 °C
- AEC-Q100 qualified
- Safety capable: documentation available to aid functional safety system design
Applications
- Industrial
- Automotive
- Power tools
- Overcurrent protection
- Controllers, sensors
Description
The TS3121 and the TS3121A single comparators permit high-speed response time at low power consumption over a supply voltage specified from 1.7 to 5.5 V. These devices operate over a wide temperature range from -40 °C to +125 °C making them ideal for industrial and automotive applications with the associated qualification. Thanks to an embedded fail-safe circuit, the TS3121 and the TS3121A can operate with input/output pins biased while the supply pin is shut down to VCC = 0 V for energy saving applications. A guaranteed start-up time ensures a stable output condition after activating the supply rail. Thanks to their small package size, the TS3121 and the TS3121A can be used in applications where space on the board is limited. It can thus reduce the overall cost of the PCB. SC70-5 SOT23-5 Maturity status link TS3121, TS3121A
Related products
TS880 For lower supply current TS3011 For higher speed TS3021 For push-pull output Rail-to-rail, open-drain comparator with embedded fail-safe input/output TS3121, TS3121A Datasheet DS14484 - Rev 3 - April 2025 For further information, contact your local STMicroelectronics sales office.
1 Pin configuration
Figure 1. Pin connection (top view) Table 1. Pin description
1 OUT Output
2 VCC- Negative supply voltage
3 IN+ Positive input voltage
4 IN- Negative input voltage
5 VCC+ Positive supply voltage
2 Maximum ratings
Table 2. Absolute maximum ratings
- All voltage values, except differential voltage, are with respect to the network ground terminal.
- Input current must be limited by a resistor in series with the inputs.
- Short circuits can cause excessive heating and destructive dissipation.
- According to JEDEC standard JESD22-A114F.
- According to ANSI/ESD STM5.3.1.
Table 3. Operating conditions
- As long as one input is within the common mode input voltage range, the second one can be within -0.2 V to 5.5 V and the
3 Electrical characteristics
Table 4. Electrical characteristics - VCC = 5 V, Vicm = VCC/2, T = 25 °C (unless otherwise specified).
- Hysteresis is a built-in feature of the TS3121. It is defined as the voltage difference between the trip points.
Electrical characteristics
- Maximum high-level output leakage current at T = 25 °C is guaranteed by design. 3. tPLH is measured when the output signal crosses a voltage level at 50% of Vcc with the following conditions: inverting inputvoltage (IN-) = VICM and non-inverting input voltage (IN+) moving from VICM - 100 mV to VICM + overdrive. 4. tPHL is measured when the output signal crosses a voltage level at 50% of Vcc with the following conditions: inverting inputvoltage (IN-) = VICM and non-inverting input voltage (IN+) moving from VICM + 100 mV to VICM - overdrive.
Table 5. Electrical characteristics - VCC = 3.3 V, Vicm = VCC/2, T = 25 °C (unless otherwise specified).
Symbol Parameter Conditions Min. Typ. Max. Unit tPHL(4) CL = 15 pF, overdrive = 100 mV, VPU = VCC ns RPU = 2.5 kΩ, T = 25 °C Tmin < T < Tmax 60 85 125 tF Fall time (90% to 10%) CL = 15 pF, RPU = 2.5 kΩ, overdrive = 100 mV 3.5 1. Hysteresis is a built-in feature of the TS3121. It is defined as the voltage difference between the trip points. 2. Maximum high-level output leakage current at T = 25 °C is guaranteed by design. 3. tPLH is measured when the output signal crosses a voltage level at 50% of Vcc with the following conditions: inverting inputvoltage (IN-) = VICM and non-inverting input voltage (IN+) moving from VICM - 100 mV to VICM + overdrive. 4. tPHL is measured when the output signal crosses a voltage level at 50% of Vcc with the following conditions: inverting inputvoltage (IN-) = VICM and non-inverting input voltage (IN+) moving from VICM + 100 mV to VICM - overdrive. Table 6. Electrical characteristics - VCC = 1.8 V, Vicm = VCC/2, T = 25 °C (unless otherwise specified).
Symbol Parameter Conditions Min. Typ. Max. Unit tPLH(3) CL = 15 pF, overdrive = 100 mV, VPU = VCC ns RPU = 2.5 kΩ, T = 25 °C Tmin < T < Tmax 130 160 175 tPHL(4) Propagation delay (high to low), CL = 15 pF, overdrive = 20 mV, VPU = VCC RPU = 2.5 kΩ, T = 25 °C Tmin < T < Tmax 90 115 165 CL = 15 pF, overdrive = 100 mV, VPU = VCC RPU = 2.5 kΩ, T = 25 °C Tmin < T < Tmax 60 85 125 tF Fall time (90% to 10%) CL = 15 pF, RPU = 2.5 kΩ, overdrive = 100 mV 3.5 1. Hysteresis is a built-in feature of the TS3121. It is defined as the voltage difference between the trip points. 2. Maximum high-level output leakage current at T = 25 °C is guaranteed by design. 3. tPLH is measured when the output signal crosses a voltage level at 50% of Vcc with the following conditions: inverting inputvoltage (IN-) = VICM and non-inverting input voltage (IN+) moving from VICM - 100 mV to VICM + overdrive. 4. tPHL is measured when the output signal crosses a voltage level at 50% of Vcc with the following conditions: inverting inputvoltage (IN-) = VICM and non-inverting input voltage (IN+) moving from VICM + 100 mV to VICM - overdrive. TS3121, TS3121A
4 Typical performance characteristics
Figure 2. Supply current vs. supply voltage at Vicm = VCC, Figure 3. Supply current vs. supply voltage at Figure 4. Supply current vs. supply voltage at Vicm = VCC-, Figure 5. Supply current vs. supply voltage at Vicm = VCC,
Figure 46. High-to-low propagation delay vs. supply voltage at Vicm = VCC/2, CL = 15 pF, RPU = 2.5 kΩ, VPU = VCC
5 Application information
The TS3121 has an embedded fail-safe architecture. This feature allows power saving by dynamically turning on and off the comparator as needed during operation. Due to the fail-safe design, the input and output pins can stay biased while the power supply is disconnected (VCC = 0 V). The open-drain output stage allows the comparator to be used in level shifting applications, where the output voltage range is independent from the supply. Figure 47. Functional block diagram mode voltages from 0 V to 5.5 V and independent of VCC. the effect of temperature variations. absolute worst-case value between -40 °C and +125 °C.
Application information
DS14484 - Rev 3 page 20/34
6 Typical applications
input and output pins that allow the presence of voltage when the comparator is not supplied (VCC = 0 V). the comparator are provided by the GPIO pin of a microcontroller which is activated during 100 µs every 100 ms. transition phase when the sensor voltage and reference voltage are equivalent (Vdiff = Vio). Figure 54. Typical application schematic
7 Package information
To meet environmental requirements, ST offers these devices in different grades of ECOPACK packages, depending on their level of environmental compliance. ECOPACK specifications, grade definitions, and product status are available at: www.st.com. ECOPACK is an ST trademark. TS3121, TS3121A
Package information
DS14484 - Rev 3 page 25/34
7.1 SC70-5 (or SOT323-5) package information
Figure 55. SC70-5 (or SOT323-5) package outline Table 7. SC70-5 (or SOT323-5) package mechanical data DS14484 - Rev 3 page 26/34
7.2 SOT23-5 package information
Figure 56. SOT23-5 package outline Table 8. SOT23-5 mechanical data DS14484 - Rev 3 page 27/34
8 Ordering information
Table 9. Order code
- Qualified and characterized according to AEC Q100 and Q003 or equivalent, advanced screening according to AEC Q001 &
Ordering information
DS14484 - Rev 3 page 28/34
Revision history
Table 10. Document revision history 31-Jul-2024 1 Initial release. 14-Nov-2024 2 Updated description on the cover page. 10-Apr-2025 3 Updated Figure 1. Pin connection (top view).
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